dbms_stats.gather_schema_stats make not be computing stats

I set monitoring to YES in all 14000+ tables.
In the sys.dba_tab_modifications table there are 207 tables.
Question: Does this mean that there are 207 tables with STALE staistics? From what I have read, that answer is suppose to be - yes.
When I run the following script nightly, the number of tables (all owned by DBADMIN), in the sys.dba_tab_modifications is not decreasing:
execute dbms_stats.gather_schema_stats ('DBADMIN', NULL, FALSE, 'FOR ALL COLUMNS SIZE 1', NULL, 'DEFAULT', TRUE, NULL, NULL, 'GATHER STALE', 'LIST');
Here is a sample output from the sys.dba_tab_modifications table:

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Received on Thu Nov 21 2002 - 01:03:27 CST